If you think you know what is actually in the food you are buying, you could be wrong.  You may not want to always rely on the label.  Several key products are prime targets for food fraud.

"About 10 percent of the food you buy in the grocery shelf is probably adulterated," said Shaun Kennedy with the National Center for Food Protection and Defense.

Some of the biggest culprits are fish products.  For example, when you buy crab, you might be getting fake crab.

Fruit juices are another target.  Sometimes juice is labeled as fresh squeezed, when it is really made from concentrate.

"In some cases, pomegranate juice has been found to be nothing more than water, citric acid and red food coloring," said Kennedy.

Another product to watch out for is olive oil.  Experts say 65 percent of extra virgin olive oil tested at the grocery store is actually diluted with lower grade oils.

"Consumers have almost gotten used to this flavor, these off flavors that reflect the defects you find in bad olive oil," said Dan Flynn of UC Davis Olive Center.

There is also the problem of honey laundering.  That is when honey from countries with trade embargoes is shipped through approved countries then sent to the United States.

Expired infant formula and wine are also on the list of fake or mislabeled products.

Researchers say food fraud costs the U.S. $10 to 15 billion dollars a year.  Counterfeiters rake in the cash.

Experts say consumers should be careful of something that looks to good to be true.  If it is cheap, the quality may not be as good. And try to shop for trusted brands.